Concrete construction



W. J. DVORAK CONCRETE CONSTRUCTION Filed Feb. 17, 1930 llnnnnnlnn June 13, 1933.

Patented June 13, 1933 UNITE lSTATESY wnNznL J. nvonAK,

OF HOUSTON, TEXAS CONCRETE CONSTRUCTION Application ined February 17, 1930. seriai No. 429,070.

rlhis invention relates to new and useful improvements in Concrete construction.,

@ne object of the invention is to provide an improved type of concrete construction wherein pre-cast slabs may be assembled and tied to the suljiporting` girders, or framework, in a novel manner, said framework, in the main, being formed of concrete and cast'in place.

Another object of the invention resides in a novel type of concrete construction special# ly adapted for use in the construction of roofs, floors, walls, stairways: and the like and embodying the use of pre-cast'units, conuected together, and to the structure, in a novel way.

With the above and other objects in View this invention has particular r-elation to-certain novel features of construction, arrangement of parts, and use, an example of which is given in this specification and illustrated in the accompanying drawing, wherein Figure 1 shows a 'plan view of the slabs employed, shown connected together.

Figure 2 shows a cross sectional view taken on the line 22 of Figure 1.

Figure 3 shows a cross sectional view taken on the line 3 3 of Figure 1.

Figure 4: shows an edge view of a slab.

Figure 5 shows ay longitudinal sectional view taken on the line 5 5 of Figure 1.

Figure 6 shows a fragmentary front elevation of a stairway embodying the invention.

Figure '7 shows a fragmentary cross sec- 'tional view taken on the line .7-7 of Figure 6.

Figure 8 shows a fragmentary plan View of said stairway, partly in section, and

Figure 9 shows a fragment-ary side elevation thereof.

Referring now more particularly to the drawing, wherein like numerals of reference designate similar parts in each of the gures, the numerals 1 designate concrete slabs, preferably rectangular in form. These slabs are pre-cast and preferably have smooth upper surfaces. Each slab, at one edge, has an olfset forming a V -shaped groove 2 from end to end thereof and at its other edge has a lengthwise marginal rib 3. Spaced apart along each slab are reinforcing rods as t which are embedded in the material thereof and which are formed with the loops 5 projecting into the corresponding grooves 2 and also the loops 6 which project out through the Vcorresponding rib 3. The grooved margins of the slab aso have the marginal thickened ribs 7 and the reinforcing rods l are formed also into the loops 3 in said'ribs 7 and there are the lengthwise reinforcing rods 9 extending through the ribs 7 within said loops 8. Each slab 1 also has the marginal dowel pins 10 at one margin, adapted to be inserted into corresponding sockets 11 in the adjacent margin of the adjoining slab, said dowel pins serving to hold said slabs in alignment during the process of erection. The slabs also have suitable lengthwise reinforcing rods 12 therethrough which are formed into the projecting end loops 13.

In erecting the slabs into the structure said slabs are placed in their proper position in which position they are held by suitable temporary framework (not shown). In this position the marginal loops 5, 6 overlap in the grooves 2 and the end loops 13 also register or overlap. The ends o' the respective tiers of slabs are spaced apart and, during the process of erection the girders as 14 are poured in place while in plastic state. Previous to pouring said girders suitable tie rods as 15 are insert-ed through said overlapping loops 13 and are surrounded by suitable reinforcing rings 16. When the girders are poured'the reinforcing consisting of the rods V15 and the rings 16, are completely embedded therein and the loops 13 serve to tie the slabs to the supporting girders. The overlapping loops 5, 6, in the respective grooves 2, are tied togetherby the tie rods 13 whichare inserted therethroughand said grooves 21 are then filled with plastic concrete which embeds said loops and tie rod therein and the concrete material filling said grooves is then smoothed olf flush with the surface of the slabs.

In Figures 6 to 9, inclusive, the invention is shown as applied to the erection of stairways wherein the numeral 18 designates the supporting masonry and the numeral 19 designates the finishing precast slabs shaped so that when erected suitable steps Will be thereby formed as illustrated in Figure 7 each pre-cast slab 19 has spaced transverse rods 20 embedded therein and projecting at the rear margin of the tread forming the upstanding loops 21. [it the lower inside` Inargin of the riser of each slab 19 there is a transverse groove 22 into which the upstanding loops 21 extend and the rods 2() are also formed into loops 23 in said grooves 22 which overlap the upstanding loops 21 and tie rods 24 are inserted through said overlapping loops to tie the tread of each step slab to the riser of the slab above. Embedded in and projecting from the masonry of the 'foundation 18, which forms an anchor, are the anchor loops 25 which surround the respective upstanding loops 1 and anchor the step slabs in place.

rlhe dra-Wing and description disclose what I novv consider to be a preferred form of the invention by Way of illustration only, While the broad principle of the invention will be defined by the appended claims.

l/Vhat I claim is:

1. A concrete construction formed of concrete slabs, the adjacent edges of said slabs being provided, one with a thicke ed rib having a longitudinal groove in which the adjacent margin of the other slab projects, said adjacent margins also having projecting loops which overlap and tie rods fitted through said overlapping loops to secure adjacent slabs together.

2. A concrete construction for forming plane surfaces and formed of concrete slabs, the adjacent edges of said slabs being formed, one With a lengthwise groove into which the other projects, transverse reinforcing rods spaced apart in each slab said rods of said slabs projecting into said groove and being formed into overlapping` loops, a tie rod in said groove fitted through said overlapping loops and tying said slabs together, the adjacent edges of adjoining slabs being provided one With a doWel and the other ,With abearing to receive said dowel and lengthwise reinforcing rods in each slab around Which said transverse bars are looped.

3. Aconcrete construction formed of united concrete slabs, the adjacent edges of said slabs having projecting loops Which overlap and tie rods fitted through said overlapping loops to secure adjacent slabs together, the adja.- cent edges of adj oining slabs being provided, one With projecting doWels and the other With bearings to receive said dowels to maintain said slabs in alignment.

4. A concrete construction formed of precast slabs arranged With their margins adj acent, spaced transverse reinforcing rods embedded in each slab and projecting outwardly at one margin and formed into loops, the adjacent margin of the other slab being recessed to receive said loops, the reinforcing rods of each slab being also formed into loops in the recessed portion of said slab, said loops in said recesses overlapping, tie rods extending through said overlapping loops, anchor rods embedded in a stationary anchor and end loops at the ends of the slabs surrounding the anchor rods and securing said slabs to said anchor.

5. In a concrete construction for floors and the like, a concrete slab having one margin thickened forming a longitudinal rib and reinforcing transverse ribs extending from said marginal rib toward, but falling short of the opposite margin of the slab, said longitudinal rib, and cross ribs being formed integrally With the slab.

6. In concrete construction a slab thickened at one margin forming a longitudinal rib, said slab having a longitudinal groove at said margin, cross ribs extending from said longitudinal rib toward, but falling short of the opposite margin of the slab, reinforcing rods embedded in the material of the slab, and formed into loops Which project into said groove at one margin of the slab and also formed into projecting loops at the opposite margin of the slab.

7. In concrete construction a slab having a longitudinal marginal rib formed with a longitudinal recess, a reinforcing rod em- 9 bedded in the material of said slab and formed with a loop which projects into said recess and said rod being also formed with a projecting loop at the opposite margin of the slab which projects at substantially right angles to the plane of the slab.

8. A. cementitious slab having an approximately plane upper surface and being thickened at one margin to form a depending longitudinal rib, said margin also having a longitudinal groove, depending, transverse ribs, spaced apart, and formed integrally With the slab and with the marginal rib thereof, said transverse ribs falling short of the other margin of the slab, transverse reinforcing rods in said slab Which terminate in loops in said groove and in loops Which project from the opposite margin of the slab.

In testimony whereof I have signed my name to this specification.

WENZEL J. DVORAK. 

